Internal-combustion engine



- 1,640,950 Aug- 1927' c. E. LUCKE INTERNAL COMBUSTION ENGINE Filed May 24. 1923 Patented Aug. 30, 1927.

UNITED STATES PATENT OFFICE.

CHARLES E. LUCKE, OF NEW YORK. N. Y., ASSIGNOR TO WORTHINGTON FUN? AND MACHINERY CORPORATION, OF NEW YORK. N. Y., A CORPORATION OF VIRGINIA.

INTERNAL-COMBUSTION ENGINE.

Application filed May 24,

a construction in whichthe scavenging air or part of it is compressed by the piston on n its outward stroke. with the air thus compressed delivered to the cylinder through -short passages from the compre sing chamber, and in which ailitomatic suction and dis chargevalvcs are arranged close to the pis- 15 ton, so as to provide con' iparatively small clearances to. the'piston in its outward stroke, with the result that there is no coniderable body of scavenging air between the cylinder and rear side of the piston to be, affected by irregularities in the combustion cylinder pressure. .I thus obtain a more steady and uniform flow of scavenging air to the cylinder, with corsequently more sat istactory operation and greater efficiency.

A, further object is to provide simple and ellicient means for augmenting the supply of scavenging air to the cylinder above that supplied by the displacement compressor formed by the-engine. piston. For this purpose 1 use a blower driven by the engine, so as to maintain a constant supply of com pressed air which is delivered through suitable check".'alve.:: to the cylinder when the pre sure therein is reduced below that of the supply from the blower. This blower supply of Hcuvvnging air may be at a'lower pressure than that furnished by the displacement compressor or by the engine piston, the scavenging air from the displacement COlllPIGHSOl then supplying scavenging air during the lirst part of the scavenging and air supply operation, until the pressure drops to such a point that the valve from the blower supply opens. Thus the supply of high pressure scavenging air from the displacement compressor may be comparatively small and relied upon only for high pressure air to produce thorough scavenging, and the desired cylinder supply be secured by the blower.

In the accompanying drawings forming a part. of this specification. the invention is illustrated as applied in its preferred form to a three-cylinder two-cycle engine of wellknown type, and this construction will now 1923. set-mine. 641,043.

be described and the features forming the invention specifically pointed out in the claims.

In the drawings- Figurel is a sectional elevation of-the engrine transversely to the shaft, and

Figure 2 is a plan view of the engine.

A is thee-ngineframe, 13 the'cylinders, C the piston shown as connected by piston rod lll,'crosshead l1 and pitman 12 to the crank on engine shaft D, the engine bein shown as of the crosshead type. a are the exhaust port connected to the exhaust manifold, and I) the scavenging and air supply ports,

these ports being opened and closed by the piston in the usual manner. The cylinder space at the rear side of the piston below the ports (i. b tor-ins a compressing chamber coat-ting with the rear side of the piston C as a di placement compressor, this compressor having, suction valves and discharge valves (i connecting the compressing C-l'ltltilher with inlet 13 and discharge chamber l-l,

'WlllCll discharge chamber 14 is 01- small size and connected by a short passage 15 directly to thescavenging ports Z). The valve; 0. d may be of any suitable automatic type opening under light pressure, but preferably and as shown, are't-he. same as shown and described in United States Letters Patent No. 1341,1 15, dated May 25, 1920, to Robert Meyer. 7

\Vith the construction shown and described above. it will be seen that the scavenging air is substantiallv free from irregularities due to cylinder action. there being no considerable body of scavenging air to be affected thereby. b t the compressor delivering through a small cylinder clearance and discharge valves to the cylinder with only a small discharge chamber and short passagebetween the compressor and cylinder.

The cylinder air supply is increased above that. ol' the displacement compressor by a suitable rotary blower or compressor, which may be driven and connected to the cylinder in any suitable manner. As shown, the blower F is driven by gearing 16 directly from the engine shaft D and delivers through pipe 17 to 'a header G from which the air passes to the respective cylinders through separate pipes 18, each controlled by automatic valves 6 which preferably and as shown are of the same form as the valves 0, d. Each cylinder thus receives ment within the broader features of the in-- vention. Also that-the invention is not limited to the axact form or arrangement of parts-illustrated, but thatmodificatins may be made within the'scope of the claims. 'YVhat. I claim isr 1. The combination with the piston and cylinder of an internal combustion engine havin scavenging ports in the side Wall of the cy inder opened and closed by'the piston, of an air compressing chamber on the rear side of the piston forming with the latter a displacement compressor, suction and discharge valves for'the compressor arranged close to the compressing chamber, a assage of small capacity directly from tie discharge valves-to the scavenging ports, and a blower and connections to the cylinder for augmenting the supply of air furnished by said displacement compressor. i

2. The combination with the piston and cylinder of an internal combustion engine having scavenging ports in the side wall of the cylinder opened and closed by the piston, of an air compressing chamber on the rear side of the piston forming with-the latter a displacement compressonsuctionand d s- .ch arge valves for the compressor arranged.

close to the compressing chamber, a passage of small capacity directly' from the discharge valve to the scavengin ports, a blower for augmenting the supp l of scavenging-air furnished by said displacement compressor, a connectiontfrom said blower to the cylinder scavenging ports, and an automatic check valve opening toward the cylinder in said blowerconnection.

3. The combination with the pistons and cylinders of a multicylinder internal combustion engine having scavenging. ports in the side walls of the cylinders opened and closed by the pistons, of ana ir compressin chamber on the rear side of each of sai pistons forming with said pistons a displacement compressor for each cylinder, sucand discharge valves arranged close to saidcompressing chambers, short passages --from the discharge valves to the scavenging portsfli header having a connection-to each pylinder, an automatic check valve between t e header and each cylinder, said check valves opening toward the cylinders, and a augmenting the supply ofairfurnished by said displacement compressor.

5. The combination with the piston and cylinder of an internal combustion engine having scavenging ports in the sidewall of the cylinder opened and closed by the piston, of a displacement compressor, suctionand discharge valves for the compressor arranged close to the compressing chamber, a passage of small capacity directly from the discharge valve to the scavenging ports, ablower for augmenting'the supply of scavenging air furnished by saiddisplacement compressor, a connection from said blower to the cylinder scavenging ports, and an automatic check valve opening toward the cylinder in said blower connection.

6. The combination with the pistons and cylinders of a multicylinder internal conibustion engine having scavenging ports' in the side walls of the cylinders opened and closed by the pistons, of a displacement compressor for each cylinder, suction and discharge valvcs arranged close to said compressing chambers, short passages from the discharge valves to the scavengingports, a header having a connection to each cylinder,

an automatic check valve between the header and each cylinder, said check .val'ves opening toward the cylinders, and a blower for supplying air to said header to augment the supply of air furnished by the displacement compressors. 7. The'combination with the piston and cylinder of an internal combustion engine having scavenging ports in the side wall of the cylinder opened and closed by. the piston, of a displacement compressor and its coinpressing chamber, suction and discharge valves for the compressor, a passage of small CEIPHClbYfIOID the discharge valves to the scavenging ports, said compressing chamber, valves and passages being arranged to pro vide small air capacity between the compressor and engine cylinder, whereby irre iilarities in the air supply are avoided, an a blower and connections to the cylinder for augmenting the supply of air furnish'ed by said displacement compressor.

In testimony whereof, I have hereunto set m hand.

y CHARLES ELLUCKE; 

